This paper describes a novel quantitative phase microscopy based on a simple self-referencing scheme using
Michelson interferometry. In order to achieve the homogeneous reference field for accurate phase measurement,
the imaging field-of-view (FOV) is split onto the sample and homogenous background areas. The reference field
can be generated by rotating the relative position of the sample and homogenous background in the object arm.
Furthermore, our system is realized using an extended depth-of-field (eDOF) optics, which allows quantitative
phase measurement for an increase of the depth-of-field without moving objective lens or specimen. The proposed
method is confirmed by experimental results using various samples such as polystyrene beads and red blood cells
(RBCs).